Thanks for your help. Now I still have some question:
I buy a NM-2CE1U for 2600. It said that they
are compatible with the International Telecommunication Union
Telecommunication Standardization Sector (ITU-T) G.703/G.704 specifications,
so i think that it can support G.703( the pure 2M channel?).
Am i right?
Thanks.
""UFUK YASIBEYLI"" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
>
>
> Hello,
>
> First of all, E1 stands for 2Mbps transmission.
>
> If your transmited information is carried in a frame ( check ITU G.704
> for details ) you can seperate 64Kbps "channels" out of this
> 2Mbps signal. For example in a TDM infrastructure, you can direct each of
these
> 64K (or better to say n x 64K, 1<= n <= 31 ) channels to different TDM
eggress
> points.
> This is called Channelized E1 (CE1).
> With this framing, There are 32 x 64K channels, and channel 0 is used for
> framing/synchronization
> Channel 16 may be used for signalling if needed, depending on the use of
E1
> circuit.
> (For instance, if PBXs are connected via E1, Channel 16 is used for
signalling,
> however,
> if WAN devices are connected via channels, Channel 16 may be used for an
> additional
> data channel instead of signalling. For this reason, you may carry a
maximum of
> 30 voice channels over an E1, but 31 x 64 K data channels may be carried)
>
> If infrastructure is not TDM, then you may not need to use 64K seperate
> channels.
> PDH/SDH infrastructure can be used in this case, and you can use pure
> 2 Mbps channel. There is no synch or signalling channel loss. (There is no
> channel.)
> ( You may check ITU G.703 )
>
> If your hardware is capable of carrying n x 64 K but not capable of
channelizing
> them
> and not using multiple sub-interfaces over the same interface, then this
> fraction of
> n x 64K out of E1 is called Fractional-E1
>
> Considering 7200 series routers, Cisco PA-4E1G/120 port adapter is a full
rate
> E1 card.
> If you configure the controller as follows:
>
> controller E1 3/7
> channel-group 0 unframed
>
> then you can use Full rate 2Mbps. However if you configure :
>
> controller E1 3/7
> channel-group 1 timeslots 1-5
>
> then you have a Fractional E1 interface with a bandwidth of 320Kbps (5x64)
> (Unfortunately, this PA does not support multiple channel groups and it is
not
> channelized.
>
> PA-MC-2E1/120, on the other hand, supports Channelized-E1 ( and also
full-rate
> E1 with the above commands)
>
> controller E1 3/1
> channel-group 1 timeslots 1-15
> channel-group 17 timeslots 17
> channel-group 18 timeslots 18
>
> and we have 3 subinterfaces of 960Kbps, 64Kbps, 64Kbps respectively.
>
> Hope this helps and not long enough to make it more confusing :-)
>
> Regards,
> Ufuk.
>
>
>
>
>
>
>
> "vtam" <[EMAIL PROTECTED]> on 31.08.2000 09:35:34
>
> Department:
>
> Please respond to "vtam" <[EMAIL PROTECTED]>
>
> To: [EMAIL PROTECTED]
> cc: (bcc: UFUK YASIBEYLI/FINANSBANK)
>
> Subject: Help about E1
>
>
>
>
> There are several E1 standard like Channelized E1, Fractional E1, Full
rate
> E1. What is the different between them? And can i use channelized E1 card
> to connect Fractional E1, Full rate E1? Thanks.
>
>
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